After Ethiopian Airlines Flight 302 crash killed 157 people, several nations barred the Boeing 737 Max 8. Until Trump’s announcement, the Federal Aviation Administration had said that it didn’t have any data to show the jets are unsafe.

Trump cited “new information” had come to light in the ongoing investigation into the incident. He didn’t elaborate.

Travelers who need to check flight status and aircraft type can do so a couple of ways. First, check your ticket to determine the aircraft type. It’s often listed as “equipment.”

Flight tracking websites also can help determine what’s flying at any given moment. For example, FlightAware.com shows United 1117, operating a Boeing 737 Max 9, is due to land at LAX by 2:22 p.m. The site said the flight, with the aircraft type listed as “B39M,” is running 8 minutes late. Two other Max 9 aircraft (United 2373 and 417) and were heading to the Hawaiian islands from LAX.

The travel website kayak.com told MarketWatch it would begin including aircraft type.

If you want to switch flights based on the assigned aircraft, be warned: That will most often come with steep flight-change fees.

Trump’s order to ground the two aircraft types came hours after Canada’s transport minister said newly available satellite-tracking data suggested similarities between the crash in Ethiopia and another accident last October. In a statement released after Trump’s announcement, the FAA also cited “newly refined satellite data” as supporting the decision to ground the jets, the New York Times reported.